Danny has a 15-foot board that he wants to use as a motorcycle ramp. if danny wants the end of the ramp to be 4 feet off the ground, what angle will be formed between the board and the ground? round the answer to the nearest whole degree.

In the right triangle formed, the side that is opposite of the angle being referred to is 4 ft and the hypotenuse is 15 ft. The proper trigonometric function that must be used is the sin such that, 
                                 sin A = opposite / hypotenuse = 4 ft / 15 ft
The value of the angle is 15°.